Latest DNA REPLICATION Multiple choice Questions and Answers pdf download
1. Both strands of DNA serve as templates concurrently in
A. replication
B. excision repair
C. mismatch repair
D. none of these
Answer: A
2. Proofreading activity to maintain the fidelity of DNA synthesis
A. occurs after the synthesis has been completed
B. is a function of the 3′-5′ exonuclease activity of the DNA polymerases
C. requires the presence of an enzyme separate from the DNA polymerases
D. occurs in prokaryotes but not eukaryotes
Answer: B
3. Which of the following repairs nicked DNA by forming a phosphodiester bond between adjacent nucleotides?
A. Helicase
B. DNA gyrase
C. Topoisomerases
D. DNA ligase
Answer: D
4. The enzyme that catalyzes the synthesis of DNA is called
A. DNA polymerase
B. DNA gyrase
C. DNA ligase
D. helicase
Answer: A
5. Which of the following possesses both 5′-3′ and 3′-5′ exonuclease activity?
A. Kornberg enzyme
B. DNA polymerase III
C. Taq DNA polymerase
D. None of these
Answer: A
6. Which of the following statements on replication in E.coli is correct?
A. It occurs in a unidirectional manner
B. It occurs in bidirectional manner
C. Always uses T7 DNA polymerase when infected by T7 phage
D. Occurs only when ? phase has infected E. coli
Answer: B
7. The replication of chromosomes by eukaryotes occurs in a relatively short period of time because
A. the eukaryotes have more amount of DNA for replication
B. the eukaryotic replication machinery is 1000 times faster than the prokaryotes
C. each chromosome contains multiple replicons
D. eukaryotic DNA is always single stranded
Answer: C
8. In E.coli, which enzyme synthesizes the RNA primer for Okazaki fragments?
A. DnaA
B. DnaC
C. DnaG
D. all of these
Answer: C
9. During which of the following process a new copy of a DNA molecule is precisely synthesized?
A. Trasformation
B. Transcription
C. Translation
D. Replication
Answer: D
10. DNA gyrase is inhibited by
A. tetracycline
B. nalidixic acid
C. both (a) and (b)
D. cephalosporin
Answer: B
11. Which of the following enzymes unwind short stretches of DNA helix immediately ahead of a replication fork?
A. DNA polymerases
B. Helicases
C. Single-stranded binding proteins
D. Topoisomerases
Answer: B
12. During DNA replication in prokaryotes, synthesis begins on the circular chromosome
A. always at the same place
B. at any stretch of DNA that is high in AT pairs
C. randomly on the chromosome
D. at the promoter
Answer: A
13. DNA replication rates in prokaryotes are approximately of the order of
A. 10 bases per second
B. 1,00 bases per second
C. 1,000 bases per second
D. 10,000 bases per second
Answer: C
14. Which of the following lacks 3′-5′ exonuclease activity?
A. Short fragment of DNA polymerase I
B. Taq DNA polymerase
C. T4 DNA ligase
D. All of the above
Answer: D
15. The synthesis of DNA by DNA polymerase occurs in the
A. 3′ to 5′ direction
B. 5′ to 5′ direction
C. 5′ to 3′ direction
D. 3′ to 3′ direction
Answer: C
1. Both strands of DNA serve as templates concurrently in
A. replication
B. excision repair
C. mismatch repair
D. none of these
Answer: A
2. Proofreading activity to maintain the fidelity of DNA synthesis
A. occurs after the synthesis has been completed
B. is a function of the 3′-5′ exonuclease activity of the DNA polymerases
C. requires the presence of an enzyme separate from the DNA polymerases
D. occurs in prokaryotes but not eukaryotes
Answer: B
3. Which of the following repairs nicked DNA by forming a phosphodiester bond between adjacent nucleotides?
A. Helicase
B. DNA gyrase
C. Topoisomerases
D. DNA ligase
Answer: D
4. The enzyme that catalyzes the synthesis of DNA is called
A. DNA polymerase
B. DNA gyrase
C. DNA ligase
D. helicase
Answer: A
5. Which of the following possesses both 5′-3′ and 3′-5′ exonuclease activity?
A. Kornberg enzyme
B. DNA polymerase III
C. Taq DNA polymerase
D. None of these
Answer: A
6. Which of the following statements on replication in E.coli is correct?
A. It occurs in a unidirectional manner
B. It occurs in bidirectional manner
C. Always uses T7 DNA polymerase when infected by T7 phage
D. Occurs only when ? phase has infected E. coli
Answer: B
7. The replication of chromosomes by eukaryotes occurs in a relatively short period of time because
A. the eukaryotes have more amount of DNA for replication
B. the eukaryotic replication machinery is 1000 times faster than the prokaryotes
C. each chromosome contains multiple replicons
D. eukaryotic DNA is always single stranded
Answer: C
8. In E.coli, which enzyme synthesizes the RNA primer for Okazaki fragments?
A. DnaA
B. DnaC
C. DnaG
D. all of these
Answer: C
9. During which of the following process a new copy of a DNA molecule is precisely synthesized?
A. Trasformation
B. Transcription
C. Translation
D. Replication
Answer: D
10. DNA gyrase is inhibited by
A. tetracycline
B. nalidixic acid
C. both (a) and (b)
D. cephalosporin
Answer: B
11. Which of the following enzymes unwind short stretches of DNA helix immediately ahead of a replication fork?
A. DNA polymerases
B. Helicases
C. Single-stranded binding proteins
D. Topoisomerases
Answer: B
12. During DNA replication in prokaryotes, synthesis begins on the circular chromosome
A. always at the same place
B. at any stretch of DNA that is high in AT pairs
C. randomly on the chromosome
D. at the promoter
Answer: A
13. DNA replication rates in prokaryotes are approximately of the order of
A. 10 bases per second
B. 1,00 bases per second
C. 1,000 bases per second
D. 10,000 bases per second
Answer: C
14. Which of the following lacks 3′-5′ exonuclease activity?
A. Short fragment of DNA polymerase I
B. Taq DNA polymerase
C. T4 DNA ligase
D. All of the above
Answer: D
15. The synthesis of DNA by DNA polymerase occurs in the
A. 3′ to 5′ direction
B. 5′ to 5′ direction
C. 5′ to 3′ direction
D. 3′ to 3′ direction
Answer: C
Good information
ReplyDeleteGood information
ReplyDeleteUnfortunately there are a lot of AIDS/Herpes denials on Herbal cures still out there. I did research on them after I was tested HIV/Herpes positive I was so worried am I going to die soon. I continue my search again on herbal remedy for Std, then I found lots of testimony on how Dr Itua Herbal Medicine Cured HIV/Aids, Herpes Virus,Copd, Hepatitis, Diabetes, On websites sharing their testimonies, which made much more sense to me. All the authors pronounce Dr Itua As a man with Good Heart, I pick interest in their testimonies and I contact him about my situation then he gave me procedure how it works, I proceed after one week he courier his Herbal Medicine to me and instruct me on how to drink it for two weeks to cure. I receive His Herbal Medicine so I drank it for two weeks as I was told then after 2 days I go for a test I found out I was cured from HIV/Aids & Herpes Virus, I pay homage to him 2 months ago to his country to celebrate with him on his African festival which he told me it usually happens every year. I know there are lots of (HIV)/Aids&Herpes Virus denials of Herbal Remedy movement the same few doctors and they represent a very small faction of the community. I could have died because I refused Natural Herbs Cures for so long, but luckily, by the grace of God I am alive to tell my story. Contact Info...Whatsapp Number...+2348149277967,Email...drituaherbalcenter@gmail.com/My Instagram Username...avat5634 Just in case you need someone to talk with.
ReplyDeleteI was born epileptic, but I am now free and cured with Dr Itua Herbal Made Medicine. I was seventeen and sitting at my computer when I fell out of my chair. Only thing I remember is waking up with the worse headache I had ever had in my life. I had never taken medication and I hated swallowing pills but I had to start. I switched between all kinds of medication because I didn't take them like I was supposed to. One day I had just finished running errands and was at my sisters house when I fell to the floor again. I woke up with a bad headache and my 2 year old Niece leaning over my leg asking me if I was OK. By then I had just started college and was one the verge of losing my license. My school is an hour away from where I live so I really got set back because I wasn't allowed to drive until I got my seizures under control. I would love to know how others have handles their epilepsy! So My sister friends Emma Told my sister about a herbal Doctor who reside in west Africa(Nigeria) Because Emma is from Africa as well, My sister told me about it then we decided to give a try. My sister contacted him also tell him about my autism too.he assures my sister that his herbal medicine will cure my epilepsy and my autism, I paid for the herbal medicine then he delivered to Charleston Post office I was called to pick it up which i quickly did, I drank it for two weeks as prescribed happily I went for diagnose and find out my Epilepsy and Autism is gone and today making it 9 Months and I'm now free from Autism, Seizure and Epilepsy, I will continue to share Dr Itua Natural Herbal Medicine works. I will recommend Dr Itua to anyone who suffering from,,,AUTISM, EPILEPSY, SEIZURE, COLD SORE, HERPES, HIV/AIDS.Shingles,Genitals Herpes,Dr Itua Contact Information..... Email...drituaherbalcenter@gmail.com.... WhatsApp Number....+2348149277967. Live Happily Again With Dr Itua Herbal Made Medicine....
ReplyDeleteHiv disease for the last 3 years and had pain hard to eat and cough are nightmares,especially the first year At this stage, the immune system is severely weakened, and the risk of contracting opportunistic infections is much greater. However, not everyone with HIV will go on to develop AIDS. The earlier you receive treatment, the better your outcome will be.I started taking ARV to avoid early death but I had faith in God that i would be healed someday.As a Hiv patent we are advise to be taking antiretroviral treatments to reduce our chance of transmitting the virus to others , few weeks ago i came on search on the internet if i could get any information on Hiv treatment with herbal medicine, on my search i saw a testimony of someone who has been healed from Hiv her name was Achima Abelard and other Herpes Virus patent Tasha Moore also giving testimony about this same man,Called Dr Itua Herbal Center.I was moved by the testimony and i contacted him by his Email.drituaherbalcenter@gmail.com We chatted and he send me a bottle of herbal medicine I drank it as he instructed me to.After drinking it he ask me to go for a test that how i ended my suffering life of Hiv patent,I'm cured and free of Arv Pills.I'm forever grateful to him Drituaherbalcenter.Here his contact Number +2348149277967...He assure me he can cure the following disease..Hiv,Cancer,Herpes Virus,Lyme Disease,Epilepsy, ,Bladder Cancer,Colorectal Cancer,Breast Cancer,Kidney Cancer,Leukemia,Lung Cancer,Non Hodgkin Lymphoma,Skin Cancer,Lupus,Uterine Cancer,Prostate Cancer, fibromyalgia ,ALS,Hepatitis,Copd,Parkinson disease.Genetic disease,Fibrodysplasia disease,Fibrodysplasia Ossificans Progressiva,Fluoroquinolone Toxicity Syndrome,Liver/Kidney Inflammatory,Men/Woman infertility, bowel disease ,Huntington's disease ,Diabetes,Fibroid...
ReplyDelete